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    Re: Daytime Venus Rising Dip Short
    From: Alexandre Eremenko
    Date: 2012 May 5, 10:35 -0400

    When you discuss the size of the bubble, to you mean the size of the inner
    circle or of the outer circle?
    My MkIXA bubble looks like a dark ring, which is quite thick.
    I usually adjust the inner (light) disc of this ring to be slightly larger
    than the Sun.
    
    Alex.
    
    On Sat, 5 May 2012, Gary LaPook wrote:
    
    >
    > 1.5 to 2 times size of sun.
    >
    > gl
    >
    > --- On Fri, 5/4/12, Hewitt  wrote:
    >
    > From: Hewitt 
    > Subject: [NavList] Re: Daytime Venus Rising Dip Short
    > To: "NavList@fer3.com" 
    > Date: Friday, May 4, 2012, 1:01 PM
    >
    > Gary, how large a bubble do you use? For the sun with my Mk IX-A I've been 
    using a bubble about 50% larger than the sun. This leaves a narrow black rim 
    around the sun which helps me keep it centered within the bubble. My 
    intercepts with the averager are usually around 1-2 moa. Double that without 
    the averager.
    > Hewitt 
    >
    > Sent from my iPad
    > On May 4, 2012, at 12:48 AM, Gary LaPook  wrote:
    >
    > I took three daytime Venus observations with my MA-2 bubble sextant. I had 
    never been able to spot a planet with my bubble sextants before. The secret 
    for daytime planet observations is precomputing the altitude so that you can 
    set it on your sextant and then sweep the approximate azimuth, This goes for 
    using a marine sextant too and I have been able to see Venus in my Tamaya 
    before.
    >
    > The MA -2 produced very good results.
    >
    > April 16, 2012 local date.
    >
    > 17:42:42 local time, 00:42:42 Z, April 17, 2012
    >
    >> From the Navy website:
    >
    > Celestial Navigation Data for 2012 Apr 17 at  0:42:42 UT
    >
    >                 For Assumed Position:  Latitude    N  34 16.6
    >                                        Longitude   W 118 54.0    
                                 GHA                    DEC                    
    Hc                       ZN            
    > VENUS      147 04.8   N26 30.2   +64 34.6   259.9  |   -0.5   0.3   0.1  -0.1:Hs 64
    > 38
    > IC       -  2
    > Corr       0  (-0.1)
    > Ho  64 36
    > Int 1.4 T
    >
    >  Celestial Navigation Data for 2012 Apr 17 at  0:43:12 UT
    > VENUS      147 12.3   N26 30.2   +64 28.5   260.0  |   -0.5   0.3   0.1  -0.1
    >
    > Ho  64 29.5
    > Int  1.0 T
    >
    > Celestial Navigation Data for 2012 Apr 17 at  0:43:49 UT
    >
    > VENUS      147 21.6   N26 30.2   +64 20.9   260.1  |   -0.5   0.3   0.1  -0.1
    >
    > Ho  64 21
    >
    > INT  0.1 T
    >
    > I suppose that I should say the intercepts were 1 T, 1 T
    > and  zero since I can't measure to one-tenth of a minute.
    >
    > I'm pretty happy with these results.
    >
    > gl
    >
    >
    >
    >
    >
    >
    > --- On
    > Thu, 5/3/12, Alexandre E Eremenko  wrote:
    >
    > From: Alexandre E Eremenko 
    > Subject: [NavList] Re: Daytime Venus Rising Dip Short
    > To: NavList@fer3.com
    > Date: Thursday, May 3, 2012, 3:45 PM
    >
    >
    > 11 am is great.
    > I don't have a horizon within 100 miles of me, short or long, but will try
    > tomorrow with
    > my air sextant:-)
    >
    > Alex.
    >
    > On Thu, 3 May 2012, Greg Rudzinski wrote:
    >
    >>
    >> The PDT time 11:00 am. Lat 34* 10.4' N Lon 119* 13.8' W.
    >> Example: 5/3/2012
    >> UT 18:02:49  Venus  Hs 33* 45.3' Dip Short correction -23.7' (H.E. 6.5 ft. horizon .157 NM) I.C. 0.0
    >>
    >> Intercept 1.0' A  Azimuth 76.8*
    >>
    >> Greg Rudzinski
    >>
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    >> View and reply to this message: http://fer3.com/arc/m2.aspx?i=119366
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    >
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    >
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=119381
    >
    >
    >
    
    
    

       
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